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Meiosis 2011

meiosis

QuestionAnswer
asexual reproduction no union of gametes
asexual reproduction offfspring comes from one parentq
asexual reproduction mitosis occurs during this to make new offspring or new cells
asexual reproduction one parent is involved
sexual reproduction the union of gametes (egg and sperm)
sexual reproduction genetic information is exchanged during meiosis
sexual reproduction two parents are involved
diploid cell contains both pairs of homologous chromosomes
diploid in humans each cell contains 46 chromosomes which are 23 pairs
haploid cell contains one chromosome from each homologous pair
haploid gametes are _______
gametes egg and sperm are _______
gametes ______________ formed by meiosis
male sex chromosomes X Y
female sex chromosomes X X
interphase I DNA and organelles double
interphase I chromatin is present
prophase I homologous pairs meet
prophase I crossing over occurs in this phase
prophase I tetrads are formed when homologous pairs meet in this phase
crossing over chromatids wrap around each other and exchange genetic information
crossing over this exchange of genes means that the embryo has traits that are not identical to the parents
tetrad pairs of homologous chromosomes next to each other
metaphase I tetrads meet at the equator
anaphase I homologous pairs pull apart and move to opposite poles
anaphase I chromatids are still attached by centromere
telophase/cytokinesis cytoplasm starts to divide
telophase/cytokinesis there are now 2 haploid cells at the end of this phase but each chromosome still has double the amount of DNA
prophase 2 the nuclear membrane breaks down
metaphase 2 chromosomes line up at the equator
anaphase 2 sister chromatids are pulled apart and move to opposite poles
telophase 2 cytoplasm starts to divide
telophase 2 there are now 4 cells with 1/2 the chromosomes and the orginal amount of DNA before the chromosomes doubled
sperm 4 are produced during meiosis
egg ootid that gets all of the cytoplasm
polar bodies 3 cells that are formed with ootid and receive chromosomes but NO cytoplasm so they are not released.
1st division of meiosis the cells have 23 chromosomes but each chromosome(made of 2 chromatids) has double the DNA
2nd division of meiosis the sister chromatids split into 4 cells
2nd division of meiosis each cell has 23 chromosomes and now the correct (original) amount of DNA
1st division of meiosis there are 2 haploid cells with double the DNA
Created by: rfabish
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